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. 2022 Feb 18;13:835460. doi: 10.3389/fendo.2022.835460

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Copyright © 2022 Liu, Li, Wu, Zhang, Lv, Zhang, Zheng and Tong

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Forest plots comparing the risk of progression to type 2 diabetes between groups according to the ADA 2003 classification criteria. (A) The risk of progression to type 2 diabetes was higher in the ADA IGT+IFG group than in the ADA I-IGT (IGT+NFG) group. (B) The risk of progression to type 2 diabetes was higher in the ADA I-IFG group than in the ADA NFG+NGT group. (C) The risk of progression to type 2 diabetes was higher in the ADA I-IGT (IGT+NFG) group than in the ADA NFG+NGT group. (D) The risk of progression to type 2 diabetes was higher in the ADA IGT+IFG groups than in the ADA NFG+NGT group. 95% CI, 95% confidence interval; I-IGT, isolated impaired glucose tolerance; IGT+IFG, impaired fasting glucose combined with impaired glucose tolerance; I-IFG, isolated impaired fasting glucose; NFG+NGT, normal fasting glucose combined with normal glucose tolerance.